4.6L vs. 5.7L exhaust. - TundraTalk.net - Toyota Tundra Discussion Forum
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#1 (permalink) Old 12-08-2012, 09:40 AM
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4.6L vs. 5.7L exhaust.

Guys is the 4.6 and 5.7 exhaust different as far as bends & pipe size etc? Looking into building bpipes for the Tundra soon. I have a friend with a 4.6 but I realize the real interest would be in the 5.7L. Any help would be appreciated.

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#2 (permalink) Old 12-08-2012, 10:22 AM
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I'm not 100% sure but more than likely they are. Heck, even the 07-09 and 2010-2012 5.7L are different a little bit
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#3 (permalink) Old 12-08-2012, 12:21 PM
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Do all year Titans have the same B pipes? I have a buddy who wants me to build him some
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#4 (permalink) Old 12-08-2012, 02:38 PM
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Do all year Titans have the same B pipes? I have a buddy who wants me to build him some
Yes, The beauty of the titan is they have been pretty much unchanged since 04 in reguards to exhaust and basic design. 04-12 bpipes are the same 2" tiny restrictive crap Nissan should have never put on with a 5.6L V8.

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#5 (permalink) Old 12-09-2012, 01:19 PM
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Anybody know what size pipe is used with the Tundra?

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#6 (permalink) Old 12-09-2012, 03:15 PM
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Behind the muffler it is 2 3/4". In front of the muffler it varies from 2" to 2 3/8" depending on where you measure.

Attention environmentalists, reduce emissions from this:
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#7 (permalink) Old 12-09-2012, 03:41 PM
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I'm gonna have to take a look under a 4.6 and a 5.7 and see whats involved in making Bpipes for the Tundra.

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#8 (permalink) Old 12-10-2012, 11:15 AM
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Not to sound dumb but what's a B pipe.

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#9 (permalink) Old 12-10-2012, 11:47 AM
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Originally Posted by socaliallstar View Post
Not to sound dumb but what's a B pipe.
It's the part of the exhaust that connects the header to the cat back system. With stock manifolds there is no benefit to changing them. It'll just make it loud and raspy with low end torque loss, and lighter wallet syndrome.

With long tube headers that's a different story!!

The b pipes aren't the restriction. First it's the muffler, then the manifolds, then the B pipes. Changing out b pipes before changing out the manifolds is literally like putting the carriage before the horse.
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#10 (permalink) Old 12-10-2012, 11:56 AM
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Quote:
Originally Posted by socaliallstar View Post
Not to sound dumb but what's a B pipe.
^ +1, trying to picture how that works.... Must not be like a y pipe?

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#11 (permalink) Old 12-10-2012, 12:56 PM
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So basically removing the cats? Running straight from headers to the muffler?

08 RCSB Tundra- Volant CAI, DT Long Tube Headers, Dual Magnaflow Exhaust, H pipe, Custom Wenco Drive Shaft, McGaughy's 2"/4" drop kit.
14.268 @ 96.15mph "in 3000+ DA"
358HP/369TQ
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#12 (permalink) Old 12-10-2012, 01:13 PM
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Originally Posted by socaliallstar View Post
So basically removing the cats? Running straight from headers to the muffler?
Exactly. Like I said, with stock manifolds that makes little sense. See, you want either back pressure or velocity. The stock manifolds cause tons of back pressure which slows velocity right from the start. When you put a high flow b pipe on a stock manifold it makes a huge expansion chamber. The exhaust doesn't go any faster, it expands into the pipe and stays slow, only with out cats it's also loud and raspy.

On the other hand, install a set of long tube headers, which build velocity, now you can get rid of the cats, and y pipe, and etc.

I have a few guys who's cats have prematurely blown out. In these cases it makes sense to change out the b pipes and ditch the cats. But to put catless b pipes on a stock truck is just wasting a customers money and giving our trucks a bad name because it doesn't sound good to just put straight pipe there.
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#13 (permalink) Old 12-10-2012, 02:02 PM
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Hmm makes me think of cutting out the cats and welding flanges on them so I can take them on and off at will. California is super strict on emissions

08 RCSB Tundra- Volant CAI, DT Long Tube Headers, Dual Magnaflow Exhaust, H pipe, Custom Wenco Drive Shaft, McGaughy's 2"/4" drop kit.
14.268 @ 96.15mph "in 3000+ DA"
358HP/369TQ
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#14 (permalink) Old 12-10-2012, 02:13 PM
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Originally Posted by socaliallstar View Post
Hmm makes me think of cutting out the cats and welding flanges on them so I can take them on and off at will. California is super strict on emissions
If u already have long tubes I would make you a set of pipes that makes that possible. I see your in SoCal. I'm just in esco, I could set up the pipes for you real cheap. Hit me up 760-877-4234
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#15 (permalink) Old 12-12-2012, 08:05 AM
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Cajun Bpipes Is looking into the Tundra market also and is in R&D now with the late model Tundra. The Bpipe swap helps the Titan pick up 7-10 hp instantly over there 2" oem pipe size. Cajuns pared with headers and a tune turns that truck into a different beast. Its just a shame the aftermarket for the Tundra is so slim because the truck is a beast now and has potential to be something else. The Jba collector flanges will likely be 2.5" on the Tundra just like the Titan headers so going to 2.5" bpipes back should help the Tundra. I can say the 5.6 Titan responded well with 2.5" piping and everyone is switching to that now after so many feared loss of torque. It will be great to see how the Tundra responds also.

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